CentOS 7.0 - man page for xchangekeyboarddevice (centos section 3)
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XChangeKeyboardDevice - change which device is used as the X keyboard
Status XChangeKeyboardDevice( Display *display,
Specifies the connection to the X server.
Specifies the device to be used as the X keyboard.
The XChangeKeyboardDevice request causes the server to use the
specified device as the X keyboard. The device must have been
previously opened by the requesting client via XOpenDevice or a
BadDevice error will result. The device must support input
class Keys, or a BadMatch error will result. If the server
implementation does not support using the requested device as
the X keyboard, a BadDevice error will result.
If the specified device is grabbed by another client,
AlreadyGrabbed is returned. If the specified device is frozen
by a grab on another device, GrabFrozen is returned. If the
request is successful, Success is returned.
If the request succeeds, a ChangeDeviceNotify event is sent to
all clients that have selected that event. A MappingNotify
event with request = MappingKeyboard is sent to all clients.
The specified device becomes the X keyboard and the old X
keyboard becomes accessible through the input extension
XChangeKeyboardDevice can generate a BadDevice or a BadMatch
An invalid device was specified. The specified device
does not exist, has not been opened by this client via
XOpenInputDevice, or is already one of the core X device
(pointer or keyboard). This error may also occur if the
server implementation does not support using the
specified device as the X keyboard.
This error may occur if an XChangeKeyboardDevice request
was made specifying a device that has no keys.
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